Commit d4bb5caa authored Sep 21, 2016 by Aaron Conole Committed by Pablo Neira Ayuso Sep 24, 2016

netfilter: Only allow sane values in nf_register_net_hook



This commit adds an upfront check for sane values to be passed when
registering a netfilter hook.  This will be used in a future patch for a
simplified hook list traversal.

Signed-off-by: Aaron Conole <aconole@bytheb.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

parent e2361cb9

net/netfilter/core.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -89,6 +89,11 @@ int nf_register_net_hook(struct net net, const struct nf_hook_ops reg)
		struct nf_hook_entry *entry;
		struct nf_hook_ops *elem;

		if (reg->pf == NFPROTO_NETDEV &&
		(reg->hooknum != NF_NETDEV_INGRESS \|\|
		!reg->dev \|\| dev_net(reg->dev) != net))
		return -EINVAL;

		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
		if (!entry)
		return -ENOMEM;